Roller screw drive and method for assembling a roller screw drive
AssigneeSchaeffler Technologies AG & Co. KG
InventorHans-Joachim TROESCH
Life of this patent
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Abstract
A roller screw drive, in particular in the form of a planetary roller gear, a roller screw drive or an inverse roller screw drive, including a threaded spindle with an external thread, a plurality of planets, and a spindle nut with an internal profile. Each planet has a profiled central section, which engages in the external thread of the spindle nut, and two equally profiled side sections which are thinner than the central section, which side sections each mesh with a section of the internal profile of the spindle nut. End sections of each planet adjoining the side sections are held in recesses of separate guide discs. Each recess for holding the planet has an assembly holding contour and an operating holding contour separated therefrom.
Claims17
A roller screw drive comprising:
- a threaded spindle with an external thread;
- a plurality of planets;
- and
- a spindle nut with an internal profile;
- wherein each planet has a profiled central section defining a roller diameter (Ro) of the planet, which central section engages in the external thread of the spindle nut and two equally profiled side sections which are thinner than the central section, which side sections each mesh with a section of the internal profile of the spindle nut, and end sections of each planet adjoining the side sections are held in recesses of separate guide discs;
- and
- wherein each recess for holding the planet has an assembly holding contour and an operating holding contour separated therefrom.
A method for assembling a roller screw drive comprising:
- providing two screw drive elements, the screw drive elements including a threaded spindle and a spindle nut, a plurality of elongated, profiled planets which are provided for direct interaction with the screw drive elements, and two guide discs which are provided for guiding one end of each planet and have recesses, into which the end of a planet can be optionally received in an assembly position or in an operating position,
- forming an assembly group of all planets and the two guide discs, wherein each planet is located in the assembly position;
- merging of said assembly group with one of the two screw drive elements;
- displacing each planet from the assembly position to the operating position;
- and
- adding the other of the two screw drive elements to complete the roller screw drive.
Dependencies are inferred from the claim text.